CN211500997U

CN211500997U - Water shortage protection control device based on water pump

Info

Publication number: CN211500997U
Application number: CN202020105848.1U
Authority: CN
Inventors: 王毅
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2020-09-15
Anticipated expiration: 2030-01-17

Abstract

The utility model discloses a water shortage protection control device based on a water pump, which comprises a controller, a feedback circuit, a current detection and output circuit, wherein the feedback circuit is connected with the current detection and output circuit; the effect is as follows: the current detection and output circuit is arranged to detect the current in the water pump running in real time, when the current value is smaller than a set threshold value according to the characteristic that the current value is abnormally smaller during water shortage, the trigger controller stops outputting, and the power supply of the external water pump is cut off, so that water shortage protection is realized.

Description

Water shortage protection control device based on water pump

Technical Field

The utility model relates to a water pump protection technical field, concretely relates to water shortage protection controlling means based on water pump.

Background

When the water pump is in operation, when water is pumped out, the water pump can idle, which not only wastes electric energy, but also easily causes the damage of the water pump due to the idle heating of the water pump. Most realize through manual operation or through water level switch among the prior art, but single relying on water level switch can not be completely effectual carries out the lack of water protection to the water pump, easily appear damaging and lead to the defect of inefficacy.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a when the lack of water, in time effectual the lack of water protection controlling means based on water pump that initiatively shuts down.

The utility model discloses the technical scheme who takes does: the utility model provides a water shortage protection controlling means based on water pump, includes controller, feedback circuit and current detection and output circuit are connected, the controller respectively with feedback circuit and current detection and output circuit are connected, current detection and output circuit still are connected with outside water pump.

Preferably, the water shortage protection control device based on the water pump further comprises a voltage detection circuit, and the voltage detection circuit is connected with the controller.

Preferably, the current detection and output circuit comprises three identical driving chips, the output end of the controller is connected with the input end of each driving chip, the output end of each driving chip is connected with the power end of an external water pump, the output ends of the driving chips are connected in a gathering mode through resistors to form a common end, and the common end is connected with the input end of the controller.

Preferably, the common terminal is further connected to the input terminal of the controller through a comparison circuit.

Preferably, the comparison circuit comprises an LMV331TP chip.

Preferably, the voltage detection circuit comprises an LM339D chip.

By adopting the technical scheme, the method has the following advantages: the utility model provides a water shortage protection controlling means based on water pump, current detection and output circuit when moving the water pump through being equipped with carry out real-time detection, when according to the water shortage, the current value can be unusual the diminishing characteristic, when being less than the settlement threshold value, trigger control ware stop output, cut off the power with outside water pump, thereby realize the water shortage protection, whole scheme is based on the circuit realization, the signal is timely effective, the defect that relies on water level switch easily to appear damaging and lead to becoming invalid has been avoided, stability and reliability thereof are improved.

Drawings

Fig. 1 is a connection block diagram of a water shortage protection control device based on a water pump according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the connection of the current detection and output circuit according to the embodiment of the present invention;

FIG. 3 is a schematic diagram of the connection of the power supply part in the embodiment of the present invention;

fig. 4 is a schematic connection diagram of a controller according to an embodiment of the present invention;

fig. 5 is a schematic connection diagram of a feedback circuit according to an embodiment of the present invention;

fig. 6 is a schematic connection diagram of a comparison circuit according to an embodiment of the present invention;

fig. 7 is a schematic connection diagram of a voltage detection circuit according to an embodiment of the present invention;

fig. 8 is a schematic connection diagram of a speed adjusting interface in an embodiment of the present invention;

fig. 9 is a schematic connection diagram of the temperature detection circuit according to the embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments, which are used for illustrating the present invention but are not used for limiting the scope of the present invention.

Referring to fig. 1 to 8, the present embodiment provides a water shortage protection control device based on a water pump, including a controller, a feedback circuit and a current detection and output circuit, where the feedback circuit is connected to the current detection and output circuit, the controller is respectively connected to the feedback circuit and the current detection and output circuit, and the current detection and output circuit is further connected to an external water pump.

Specifically, the present solution further includes a power supply portion, which is well known to those skilled in the art, and the power supply portion may adopt a combination of a storage battery and a power supply chip, so as to provide power for different electric devices in the present solution, where the power supply chip includes SD4938 and 78L05, and the specific connection structure is shown in fig. 3; the controller adopts MM32F003, comprises a plurality of analog quantity interfaces, and simultaneously, the judgment of the numerical value is also the mature prior art, and the water pump comprises a pump body and a motor, wherein the motor can adopt a permanent magnet synchronous motor, which is well known by the technical personnel in the field and is not described again;

the current detection and output circuit comprises three same driving chips, the output end of the controller is respectively connected with the input end of each driving chip, the output end of each driving chip is connected with the power end of an external water pump, the output ends of the driving chips are respectively connected in a gathering mode through resistors to form a common end, and the common end is connected with the input end of the controller;

referring to fig. 2, the driving chips adopt EG3012, the input terminals of the driving chips, for example, PWM-AH and PWM-AL, are connected to the output of the controller, specifically, as shown in fig. 4, which is not listed here, the output terminals of each driving chip are denoted by VS1-VS3 in fig. 2, and VS1 is also connected with MU1, and correspondingly, VS2 is also connected with MV1, VS3 is also connected with MW1, and MU1, MV1 and MW1 are connected with U, V, W of the water pump to provide power supply for the water pump; the VS1-VS3 is also used as an input end of the feedback circuit, an output end of the feedback circuit is represented by HALLA, HALLB and HALLC, and it is required to be noted that the change of signal levels of the HALLA, HALLB and HALLC can reflect the rotating speed of the water pump, and the principle is as follows:

the method is characterized in that the voltage of the non-conducting opposite potential of a winding of the motor is detected in a terminal voltage mode, the three-phase electromotive force information of the motor can be accurately obtained, the accurate phase change of the motor is realized, when a rotor of the water pump motor rotates, the three-phase terminal voltage of the winding changes rapidly, so that three pins 0-1 of HALLA-C change continuously, when the rotating speed of the rotor is increased, the change of the pins in unit time from 0-1 or 1-0 is increased, otherwise, the change is reduced, and when the rotating speed is not changed, the state of the pins 0 or HALLA-C is.

Namely, according to another water shortage detection scheme, the current and rotating speed combined water shortage detection principle is as follows: in the initial stage of normal operation of the system, in the interval of 10% -15% of the rated rotation speed, the current value is taken down and is subjected to multiple averaging treatments to be used as the idle load value hypothesis (CR0) of idle load water shortage, then the rotation speed of the water pump motor is pulled up to the rated rotation speed according to the set rated rotation speed slope, the bus current is larger as the rotation speed of the water pump motor is higher according to the fluid load characteristic, when the water pump motor is pulled up to the rated rotation speed, the current value is taken down again and is subjected to multiple averaging treatments (CR1), then the difference value between CR0 and CR1 is compared, and if the difference value is smaller than or equal to the preset multiple, the water shortage is judged (.

The common terminal is represented by IO MOTO in fig. 2, and represents a current summary of three phases; the common terminal is further connected with the input terminal of the controller through a comparison circuit, referring to fig. 6, the comparison circuit comprises an LMV331TP chip, IO MOTO obtains PEAK through a resistor R50, the PEAK is used as one input terminal of the LMV331TP chip, the connection structure of the other input terminal of the LMV331TP chip is shown in fig. 6, the output terminal BRK of the LMV331TP chip is connected with the controller, when the current is abnormal, the BRK interrupt signal is triggered, so that the controller stops outputting signals such as PWM-AH and PWM-AL, all EGs 3012 are not output, further, the MUs 1, the MV1 and the MW1 are not output, and the water pump is not powered.

Through the above scheme, the current that the electric current detection and the output circuit that utilize to be equipped with when moving the water pump carries out real-time detection, when according to the lack of water, the current value can be unusual the diminishing characteristic, be less than when setting for the threshold value (the threshold value can adopt the rated current of water pump), trigger control ware stops the output, cut off with the power of outside water pump, thereby realize the protection of lack of water, whole scheme is based on the circuit realization, need not extra sensor, the signal is timely effective, the defect that relies on water level switch easily to appear damaging and lead to becoming invalid has been avoided, stability and reliability thereof are improved.

Further, on the basis of the above embodiment, the water shortage protection control device based on the water pump further comprises a voltage detection circuit, and the voltage detection circuit is connected with the controller.

Specifically, the voltage detection circuit comprises an LM339D chip, and as shown in fig. 7, by collecting a voltage signal, namely a BUS V signal, when the voltage is abnormal, namely overvoltage, an interrupt signal BRK is also output, the output of the controller is closed, the controller is triggered to enter a protection state, and the water pump is stopped to work.

Further, on the basis of all the foregoing embodiments, referring to fig. 8, the controller is further provided with a speed regulation interface, the speed regulation interface is connected with an external speed regulation device, and the speed regulation device is a direct current speed regulator.

Specifically, AIN and G in fig. 8 indicate the connection with the dc speed regulator, and AD-Vsp is correspondingly connected with a pin on the controller, and can be used as a rotation speed regulating function of the water pump by regulating the voltage value.

Further, in order to improve the reliability of the scheme, the controller is further connected with a temperature sensor through a temperature detection circuit, the structure of the temperature sensor is shown in fig. 9, and TEMP represents that a temperature signal output is connected with the controller; therefore, the characteristic that the temperature rises when water is short is considered, and when the temperature exceeds an abnormal value, the protection can be triggered to stop outputting, so that the scheme is more reliable, and the protection can be triggered from a plurality of conditions such as temperature, current, voltage and the like.

Finally, it should be noted that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention.

Claims

1. The utility model provides a lack of water protection controlling means based on water pump which characterized in that, includes controller, feedback circuit and current detection and output circuit connect, the controller respectively with feedback circuit and current detection and output circuit connect, current detection and output circuit still are connected with outside water pump.

2. The water shortage protection control device based on the water pump as claimed in claim 1, further comprising a voltage detection circuit, wherein the voltage detection circuit is connected with the controller.

3. The water shortage protection control device based on the water pump as claimed in claim 1 or 2, wherein the current detection and output circuit comprises three identical driving chips, the output end of the controller is connected with the input end of each driving chip, the output end of each driving chip is connected with the power end of the external water pump, the output ends of each driving chip are connected in a summary mode through resistors to form a common end, and the common end is connected with the input end of the controller.

4. The water shortage protection control device based on the water pump as claimed in claim 3, wherein the common terminal is further connected with the input terminal of the controller through a comparison circuit.

5. The water shortage protection control device based on the water pump as claimed in claim 4, wherein the comparison circuit comprises an LMV331TP chip.

6. The water pump-based water shortage protection control device as claimed in claim 2, wherein the voltage detection circuit comprises an LM339D chip.